an animal with a thick , hard shell that it can move its head and legs into for protection . It eats plants , moves very slowly and sleeps during the winter .
发音
例句
1. The tortoise wins the race while the hare is sleeping. 兔子正睡觉时,乌龟赢得了比赛。 2. A tortoise has a shell on his back. 乌龟背上有硬壳。